Safety Circuit Voltage Trace - Bradford White RG1PV40SN19 Service Manual

PV Series
Safety Circuit Voltage
Trace
NOTE: This procedure assumes a cool tank.
115-volt potential exposure. Use
caution to avoid personal injury.
Remove three screws (T20 Torx screwdriver) from control
access cover on blower and remove cover (see photo 20)
Position gas control switch on the "ON"
position and adjust thermostat dial to call for
heat. Is there 10 to 13VAC between switch and
jacket head screw? (as seen in photo 21)
Blower must be running during this voltage
check.
Y
Is there 10 to 13VAC between red
wire on temp switch and jacket
head screw?
Y
N
Do you hear or can you
see the igniter sparking?
Y
Safety circuit
voltage is OK
If burner does not light, observe
LED flash code on gas valve and
refer to troubleshooting section
on page 13
36
36
WARNING
N
N
Correct igniter/sensor
problem
N
Check igniter/sensor
(see page 19)
Is igniter/sensor OK?
21
20
.
Is LED on gas valve flashing
the "heartbeat" code
(alternating bright/dim)
N
Verify 115VAC to gas
control
(see page 37)
Is there continuity through
blower temperature switch?
(see page 26)
N
Determine cause of blower
temperature switch activation and
correct
Y
Faulty cord set or
gas control
X
Y
No voltage from gas control,
call technical support
Y
Check for loose or broken wire
connection at switch terminals
Blue wire leasing to
blower temp. switch
Red wire leasing from
pressure switch
Jacket head screw